-Stat:
- VAR ID ASSIGN Expr
- | Lexpr ASSIGN Expr
- | IF Bool THEN Stats END
- | IF Bool THEN Stats ELSE Stats END
- | WHILE Bool DO Stats END
- | Call
+Statement:
+ Lexpr ASSIGN Expr
+ | VAR IDENT ASSIGN Expr
+ | Expr
+ | IF Expr THEN Statseq END
+ | IF Expr THEN Statseq ELSE Statseq END
+ | WHILE Expr DO Statseq END